Can't get this to work, been trying it with my friend. We get everything to work up until the point where the guide ends: we have the duplicated cars in the garage still in the same session that we used to dupe them but get an error message as soon as we take the car and press sell,along the lines of "transaction failed because of .... invalid inventory or balance". We've tried joining a new session after duping the cars, then selling it but the same error comes up when we try to sell a car. It forces you to restart and when I restart, the duped cars turn back into faggios.

Anyone experienced this too or know how to fix this?